Provision for Site Reclamation and Closure (Details Narrative) - Provision for Decommissioning, Restoration and Rehabilitation Costs $ in Thousands, $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CAD ($)
Statement [Line Items]
Other provisions, undiscounted cash flows	$ 4,938	$ 5,060
Major assumptions made concerning future events, other provisions, inflation rate	2.50%	2.00%
Major assumptions made concerning future events, other provisions, discount rate	1.68%	1.21%

The assumed inflation rate for the uncertainties relating to the amount or timing of outflows of economic benefits for other provisions.

No definition available.

Name:	fury_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsInflationRate
Namespace Prefix:	fury_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant